
AUTONOMOUS SYSTEM NUMBERS

(last updated 2007-05-18)

The Autonomous System (AS) numbers are used by various routing protocols.
AS numbers are allocated to the regional registries by the IANA.
	AfriNIC		<hostmaster&afrinic.net>
	APNIC		<helpdesk&apnic.net>
	ARIN		<hostmaster&arin.net>
	LACNIC		<hostmaster&lacnic.net>
	RIPE-NCC	<ncc&ripe.net>
AS Numbers can be obtained from the registry in your region.
Listed below are the allocated blocks to the regional registries.

Number         Description
-------------- -------------------------------------------------------------
             0 Reserved  - May be use to identify non-routed networks

     1 -  1876 Allocated by ARIN

  1877 -  1901 Allocated by RIPE NCC

  1902 -  2042 Allocated by ARIN

          2043 Allocated by RIPE NCC

  2044 -  2046 Allocated by ARIN

          2047 Allocated by RIPE NCC

  2048 -  2106 Allocated by ARIN

  2107 -  2136 Allocated by RIPE NCC

  2137 -  2584 Allocated by ARIN

  2585 -  2614 Allocated by RIPE NCC

  2615 -  2772 Allocated by ARIN

  2773 -  2822 Allocated by RIPE NCC

  2823 -  2829 Allocated by ARIN

  2830 -  2879 Allocated by RIPE NCC

  2880 -  3153 Allocated by ARIN

  3154 -  3353 Allocated by RIPE NCC

  3354 -  4607 Allocated by ARIN

  4608 -  4864 Allocated by APNIC

  4865 -  5376 Allocated by ARIN

  5377 -  5631 Allocated by RIPE NCC

  5632 -  6655 Allocated by ARIN

  6656 -  6911 Allocated by RIPE NCC

  6912 -  7466 Allocated by ARIN

  7467 -  7722 Allocated by APNIC

  7723 -  8191 Allocated by ARIN

  8192 -  9215 Allocated by RIPE NCC

  9216 - 10239 Allocated by APNIC

 10240 - 11263 Allocated by ARIN

 11264 - 12287 Allocated by ARIN

 12288 - 13311 Allocated by RIPE NCC

 13312 - 14335 Allocated by ARIN

 14336 - 15359 Allocated by ARIN

 15360 - 16383 Allocated by RIPE NCC

 16384 - 17407 Allocated by ARIN

 17408 - 18431 Allocated by APNIC

 18432 - 19455 Allocated by ARIN

 19456 - 20479 Allocated by ARIN 

 20480 - 21503 Allocated by RIPE NCC

 21504 - 22527 Allocated by ARIN      

 22528 - 23551 Allocated by ARIN

 23552 - 24575 Allocated by APNIC

 24576 - 25599 Allocated by RIPE NCC

 25600 - 26623 Allocated by ARIN (March 2002)
 
 26624 - 27647 Allocated by ARIN (September 2002)

 27648 - 28671 Allocated by LACNIC (November 2002)

 28672 - 29695 Allocated by RIPE NCC (December 2002)

 29696 - 30719 Allocated by ARIN (March 2003)

 30720 - 31743 Allocated by RIPE NCC (September 2003)
 
 31744 - 32767 Allocated by ARIN (November 2003)

 32768 - 33791 Allocated by ARIN (May 2004)

 33792 - 34815 Allocated by RIPE NCC (June 2004)

 34816 - 35839 Allocated by RIPE NCC (February 2005)
 
 35840 - 36863 Allocated by ARIN (February 2005)
   
 36864 - 37887 Allocated by AfriNIC (April 2005)
 
 37888 - 38911 Allocated by APNIC (June 2005)

 38912 - 39935 Allocated by RIPE NCC (September 2005)

 39936 - 40959 Allocated by ARIN (29 March 2006)

 40960 - 41983 Allocated by RIPE NCC (13 April 2006)
 
 41984 - 43007 Allocated by RIPE NCC (17 November 2006)
 
 43008 - 44031 Allocated by RIPE NCC (23 April 2007)

 44032 - 48127 Held by the IANA

 48128 - 64511 Reserved by the IANA

 64512 - 65534 Designated for private use (Allocated to the IANA)

         65535 Reserved

Specially designated Autonomous System Numbers:

23456     AS_TRANS             [RFC4893]


Registry Expansion - per [RFC4893]
 
1.0 - 1.65535         Reserved

2.0 - 2.1023          Allocated by APNIC (29 November 2006)

2.1024 - 2.65535      Held by the IANA
 
3.0 - 3.1023          Allocated by RIPE NCC (29 November 2006)

3.1024 - 3.65535      Held by the IANA

4.0 - 4.1023          Allocated by LACNIC (29 November 2006)

4.1024 - 4.65535      Held by the IANA

5.0 - 5.1023          Allocated by AfriNIC (29 November 2006)

5.1024 - 5.65535      Held by the IANA

6.0 - 6.1023          Allocated by ARIN (30 November 2006)

6.1024 - 65535.65534  Held by the IANA

65535.65535 Reserved


Reference
---------
[RFC4893]  Q. Vohra, E. Chen, "BGP Support for Four-octet AS 
           Number Space",  RFC 4893, May 2007.


[]
